CN214695471U - Automatic change hydraulic control equipment - Google Patents
Automatic change hydraulic control equipment Download PDFInfo
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- CN214695471U CN214695471U CN202120589453.8U CN202120589453U CN214695471U CN 214695471 U CN214695471 U CN 214695471U CN 202120589453 U CN202120589453 U CN 202120589453U CN 214695471 U CN214695471 U CN 214695471U
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Abstract
The utility model discloses an automatic change hydraulic control equipment belongs to hydraulic engineering technical field. Comprises a frame, an opening and closing device fixed on the frame, a gate connected with the opening and closing device, a water inlet and a water pipe; one end of the water inlet is connected with the water pipe, and the gate is arranged at the water inlet to open and close the water inlet; the device also comprises a driving control device and a monitoring device; the driving device is connected with the driving control device; the monitoring device comprises a position sensor, a liquid flowmeter, a monitoring control module and a terminal. The utility model discloses a driver drives the gate and reciprocates and goes up and down to reach the shutoff to the water inlet and open, realizes the water conservancy effect of damming and accuse flow. Drive arrangement and detection device can real time monitoring flow to with data send control terminal to through wireless mode and monitor, and be equipped with alarm module, be convenient for in time discover the water conservancy problem, handle in advance, ensure hydraulic engineering's normal operating.
Description
Technical Field
The utility model relates to a hydraulic engineering technical field, concretely relates to change hydraulic control equipment.
Background
The water conservancy canal water flow distribution and control system used at present mainly comprises a hoist, a gate, an embedded part and a hydraulic structure matched with the embedded part. The system is a water conservancy control project which is widely applied in the water conservancy industry, and can be called as a water conservancy channel water quantity control branch system. Its main function is to distribute and regulate the water flow, water quantity and closed water of main canal and branch canal to realize the goal of water quantity control.
The existing water conservancy regulation is roughly divided into two types, one type is manual regulation, namely, a gate is manually lifted or descended to achieve the opening and closing purpose. The other type is that the gate is driven electrically, namely, the gate is driven to lift in a telescopic motor or hydraulic telescopic cylinder mode to achieve the opening and closing purpose, but the stretching force of the telescopic rod is large, the service life of equipment is influenced, the closed type of the gate is poor, and water leakage is easy to occur.
However, most of the existing water conservancy channels are outdoor, and the water conservancy channels are distributed scattered, so that real-time monitoring on water conservancy is difficult to realize, and water conservancy adjustment cannot be timely and scientifically realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a can the automatic control ditch flow to the automatic hydraulic control equipment of real time monitoring ditch water yield.
In order to achieve the above purpose, the present invention is realized by the following technical solutions:
an automatic water conservancy control device comprises a frame, an opening and closing device fixed on the frame, a gate connected with the opening and closing device, a water inlet and a water pipe; one end of the water inlet is connected with the water pipe, and the gate is arranged at the water inlet to open and close the water inlet; the control equipment also comprises a driving device, a driving control device and a monitoring device;
the driving device is connected with the driving control device;
the monitoring device comprises a position sensor, a liquid flowmeter, a monitoring control module and a terminal; the position sensor is arranged at the lowest end of the gate; the liquid flowmeter is arranged at the water inlet; the position sensor and the liquid flowmeter are in signal connection with the monitoring control module; the monitoring control module comprises a data module, a signal transmission module and an alarm module; the input end of the alarm module is in signal connection with the data module;
the opening and closing device comprises a driver and a connecting rod, and the connecting rod is connected with the gate and drives the gate to move up and down; the rack comprises two upright columns symmetrically arranged at two sides of the water inlet, and the upright columns are provided with guide rails along the length direction; and a sliding auxiliary device is arranged between the two sides of the gate and the guide rail.
Further, the sliding auxiliary device is at least one rolling shaft arranged in the guide rail, and the rolling shaft is perpendicular to the running direction of the gate.
Further, the sliding auxiliary device is at least one pulley arranged on two sides of the gate, and the pulley is matched with the guide rail and slides on the guide rail.
Furthermore, one surface of the gate close to the water inlet is provided with a wear-resistant and corrosion-resistant sealing layer.
Further, the driving device comprises a driver and a power unit for providing power for the driver.
Further, the power unit comprises a power supply and a voltage and current signal acquisition module; and the voltage and current signal acquisition module is in electric signal connection with the data module.
Further, the power supply is a direct current power supply or an alternating current power supply; the direct current power supply comprises a solar power generation device and a storage battery which is connected with the solar power generation device and stores electric quantity.
Further, the solar power generation device is a solar power generation plate, or solar power generation paper, or a solar power generation film.
Furthermore, the data module comprises a signal acquisition module, a signal storage module and a signal processing module; the signal acquisition module is in signal connection with the drive control device, the position sensor and the liquid flowmeter.
Further, the signal transmission module comprises a data transmitting module, a data receiving module, a wireless network module and/or a Bluetooth module; the data transmitting module and the data receiving module are in wireless connection with the terminal through a wireless network module and/or a Bluetooth module.
The utility model discloses automatic change hydraulic control equipment, its beneficial effect lies in:
(1) the utility model discloses a driver drives the gate and reciprocates and goes up and down to reach the shutoff to the water inlet and open, realizes the water conservancy effect of damming and accuse flow.
(2) The utility model discloses a drive arrangement and detection device can real time monitoring flow to send data to control terminal through wireless mode and monitor, and be equipped with alarm module, be convenient for in time discover the water conservancy problem, handle in advance, guarantee hydraulic engineering's normal operating.
(3) The driver is driven by the power supply, and the power supply adopts the solar power generation device, so that the requirement of providing power for the opening and closing device in a remote area can be met, and the normal operation of the equipment is guaranteed.
(4) Be equipped with the slip auxiliary device, the slip auxiliary device can be rotatory according to the gate upward and downward motion, and this rotation again can reverse action in the gate, makes the gate can be more laborsaving rise, has improved the life of driver.
(5) An elastic sealing layer is arranged at the position of the gate and the water inlet, and the sealing layer is in sealing contact with the water inlet through the pressure of axial water to achieve a sealing state when the gate acts. When the gate is opened, the traction and elastic sealing layer of the opening and closing device are rebounded, so that the gate and the water inlet can be separated easily, the friction between the gate and the water inlet is reduced, the lifting of the gate is smooth, and the service life of the equipment is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is a schematic view of the gate of FIG. 2;
FIG. 4 is a schematic view of the connection of the gate to the water pipe;
fig. 5 is a schematic diagram of the control structure of the present invention.
The solar power generation device comprises a frame 1, a column 2, a gate 3, a water pipe 4, a water inlet 5, a driver 6, a connecting rod 7, a guide rail 8, a roller 9, a pulley 10, a sealing layer 11, a storage battery 12 and a solar power generation device 13.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Example 1
An automatic water conservancy control device is shown in figures 1, 4 and 5 and comprises a frame 1, an opening and closing device fixed on the frame 1, a gate 3 connected with the opening and closing device, a water inlet 5 and a water pipe 4; one end of the water inlet 5 is connected with the water pipe 4, and the gate 3 is arranged at the water inlet 5 to open and close the water inlet 5. The control equipment also comprises a driving device, a driving control device and a monitoring device;
the driving device is connected with the driving control device;
the monitoring device comprises a position sensor, a liquid flowmeter, a monitoring control module and a terminal; the position sensor is arranged at the lowest end of the gate 3; the liquid flow meter is arranged at the water inlet 5; the position sensor and the liquid flowmeter are in signal connection with the monitoring control module; the monitoring control module comprises a data module, a signal transmission module and an alarm module; the input end of the alarm module is in signal connection with the data module;
the opening and closing device comprises a driver 6 and a connecting rod 7, and the connecting rod 7 is connected with the gate 3 and drives the gate 3 to move up and down; the frame 1 comprises two upright posts 2 symmetrically arranged at two sides of the water inlet 5, and the upright posts 2 are provided with guide rails 8 along the length direction; and a sliding auxiliary device is arranged between the two sides of the gate 3 and the guide rail 8.
In this embodiment, the sliding assistance means is a plurality of rollers 9 arranged in the guide rail 8, and the rollers 9 are perpendicular to the running direction of the shutter 3. Two upright posts 2 of the frame 1 are provided with rotating holes which are used for supporting the rolling shafts 9 and are convenient for the rolling shafts 9 to rotate. Roller 9 can rotate in accordance with the upward and downward movement of gate 3, and this rotation acts in reverse on gate 3, so that gate 3 can be raised more easily, and the service life of driver 6 is increased.
In this embodiment, a wear-resistant and corrosion-resistant sealing layer 11 is disposed on a side of the gate 3 close to the water inlet 5. When the gate 3 is in closure, the sealing layer 11 supplies the pressure of the gate 3 towards the water inlet 5 through the axial water on one side of the gate 3, and the pressure makes the sealing layer 11 of the gate 3 in sealing contact with the water inlet 5 to achieve a sealing state, so that water leakage is avoided. When the gate 3 is opened, the gate 3 and the water inlet 5 can be separated easily because the traction of the opening and closing device and the elastic sealing layer 11 are rebounded, and the friction between the gate 3 and the water inlet 5 of the water passing pipe 4 can be reduced when the gate 3 moves up and down after separation, so that the gate 3 is lifted more smoothly, the service life of the equipment is prolonged, and the abrasion to the sealing layer 11 is also reduced.
In this embodiment, the driving device includes a driver 6 and a power unit that powers the driver 6. The drive 6 may be an electric drive 6, but also a pneumatic or hydraulic drive 6. In the embodiment, the electric telescopic device is more preferably selected, the electric telescopic device is connected with the connecting rod 7, one end of the connecting rod 7 is fixed at the center of the gate 3, and the gate 3 is driven to descend by the downward extension of the electric telescopic device; the upward retraction of the electric telescopic device drives the gate 3 to lift.
The power unit comprises a power supply and a voltage and current signal acquisition module. The power supply is a direct current power supply or an alternating current power supply; the dc power supply includes a solar power generation device 13 and a storage battery 12 connected to the solar power generation device 13 and storing electric power. The power source is generally electrically connected to the electric telescopic device and provides electric energy. The voltage and current signal acquisition module is mainly used for detecting the current in the power supply and is in electric signal connection with the data module. When the voltage or the current collected by the voltage and current signal collecting module is in an abnormal state for a long time, the problem of the power supply can be explained, the signal is sent to the terminal after being stored and analyzed by the data module, monitoring personnel are reminded by the alarm module, and the normal operation of the water conservancy ditch is ensured by timely distributing and overhauling the signal.
The solar power generation device 13 is a solar power generation panel, or a solar power generation paper, or a solar power generation film. These are all known devices capable of collecting solar energy and converting it into electrical energy. The solar power generation device 13 is suitable for an area where power is not supplied or power is supplied weakly, and the normal operation of the equipment can be guaranteed by solar energy because less force is required for lifting or lowering the gate 3.
In this embodiment, the data module includes a signal acquisition module, a signal storage module and a signal processing module; the signal acquisition module is in signal connection with the drive control device, the position sensor and the liquid flowmeter.
The signal transmission module comprises a data transmitting module, a data receiving module, a wireless network module and a Bluetooth module; the wireless network module and the Bluetooth module can be singly arranged or arranged in a mixed way, and two different wireless controls are realized. The data transmitting module and the data receiving module are in wireless connection with the terminal through the wireless network module and the Bluetooth module. The terminal can observe the detection data of the control equipment in real time, and remote control is achieved through the terminal.
In this embodiment, the driving control device is a control circuit board, which is a conventional control circuit board and mainly performs circuit communication, instruction sending, and signal carrier functions, and the structure and principle thereof are not described herein again.
The working principle is as follows:
manual control: when the closure is needed, the electric telescopic device is manually started, and the gate 3 is driven to descend by the downward extension of the electric telescopic device, so that the closure purpose is achieved. When the gate 3 needs to be opened, the electric telescopic device retracts upwards to drive the gate 3 to lift.
When the gate 3 is in closure, the sealing layer 11 supplies the pressure of the gate 3 towards the water inlet 5 through the axial water on one side of the gate 3, and the pressure makes the sealing layer 11 of the gate 3 in sealing contact with the water inlet 5 to achieve a sealing state, so that water leakage is avoided. When the gate 3 is opened, the gate 3 and the water inlet 5 can be separated easily because the traction of the opening and closing device and the elastic sealing layer 11 are rebounded, and the friction between the gate 3 and the water inlet 5 of the water passing pipe 4 can be reduced when the gate 3 moves up and down after separation, so that the gate 3 is lifted more smoothly, the service life of the equipment is prolonged, and the abrasion to the sealing layer 11 is also reduced.
Electric control: the terminal starts, and sends the instruction of opening or closing, and the instruction passes through wireless network module or bluetooth module transmission, and gives the data module, and the data module is through analysis processes back, sends the instruction of opening or closing for control circuit board, and control circuit board control electric telescopic device's circuit UNICOM or disconnection to the position of gate 3 makes gate 3 rise or descend through position sensor response, realizes damming and the purpose of opening the floodgate.
The liquid flow meter is arranged at the water inlet 5 and can detect the amount of water passing through the water inlet within a certain time. Is any one of a differential pressure type flowmeter, a turbine flowmeter, an electromagnetic flowmeter, a vortex shedding flowmeter, a mass flowmeter and an SST plug-in flowmeter.
The voltage and current signal acquisition module is mainly used for detecting the current in the power supply and is in electric signal connection with the data module. When the voltage or the current collected by the voltage and current signal collecting module is in an abnormal state for a long time, the problem of the power supply can be explained, the signal is sent to the terminal after being stored and analyzed by the data module, monitoring personnel are reminded by the alarm module, and the normal operation of the water conservancy ditch is ensured by timely distributing and overhauling the signal.
In addition, the water pipe in this embodiment may be a circular pipe, or may be a square pipe, which is not limited herein.
Example 2
An automatic water conservancy control device is shown in figures 2, 3, 4 and 5 and comprises a frame 1, an opening and closing device fixed on the frame 1, a gate 3 connected with the opening and closing device, a water inlet 5 and a water pipe 4; one end of the water inlet 5 is connected with the water pipe 4, and the gate 3 is arranged at the water inlet 5 to open and close the water inlet 5. The control equipment also comprises a driving device, a driving control device and a monitoring device;
the driving device is connected with the driving control device;
the monitoring device comprises a liquid flowmeter, a monitoring control module and a terminal; the liquid flowmeter is arranged at the water inlet 5 and is in signal connection with the monitoring control module; the monitoring control module comprises a data module, a signal transmission module and an alarm module; the input end of the alarm module is in signal connection with the data module;
the opening and closing device comprises a driver 6 and a connecting rod 7, and the connecting rod 7 is connected with the gate 3 and drives the gate 3 to move up and down; the frame 1 comprises two upright posts 2 symmetrically arranged at two sides of the water inlet 5, and the upright posts 2 are provided with guide rails 8 along the length direction; and a sliding auxiliary device is arranged between the two sides of the gate 3 and the guide rail 8.
In this embodiment, the sliding assistance means is at least one pulley 10 arranged on both sides of the gate 3, and the pulley 10 is engaged with the guide rail 8 and slides on the guide rail 8.
In this embodiment, a wear-resistant and corrosion-resistant sealing layer 11 is disposed on a side of the gate 3 close to the water inlet 5. When the gate 3 is in closure, the sealing layer 11 supplies the pressure of the gate 3 towards the water inlet 5 through the axial water on one side of the gate 3, and the pressure makes the sealing layer 11 of the gate 3 in sealing contact with the water inlet 5 to achieve a sealing state, so that water leakage is avoided. When the gate 3 is opened, the gate 3 and the water inlet 5 can be separated easily because the traction of the opening and closing device and the elastic sealing layer 11 are rebounded, and the friction between the gate 3 and the water inlet 5 of the water passing pipe 4 can be reduced when the gate 3 moves up and down after separation, so that the gate 3 is lifted more smoothly, the service life of the equipment is prolonged, and the abrasion to the sealing layer 11 is also reduced.
In this embodiment, the driving device includes a driver 6 and a power unit that powers the driver 6. The drive 6 may be an electric drive 6, but also a pneumatic or hydraulic drive 6. In the embodiment, the electric telescopic device is more preferably selected, the electric telescopic device is connected with the connecting rod 7, one end of the connecting rod 7 is fixed at the center of the gate 3, and the gate 3 is driven to descend by the downward extension of the electric telescopic device; the upward retraction of the electric telescopic device drives the gate 3 to lift.
The power unit comprises a power supply and a voltage and current signal acquisition module. The power supply is a direct current power supply or an alternating current power supply; the direct current power supply comprises a solar power generation device 13 and a storage battery which is connected with the solar power generation device 13 and stores electric quantity. The power source is generally electrically connected to the electric telescopic device and provides electric energy. The voltage and current signal acquisition module is mainly used for detecting the current in the power supply and is in electric signal connection with the data module. When the voltage or the current collected by the voltage and current signal collecting module is in an abnormal state for a long time, the problem of the power supply can be explained, the signal is sent to the terminal after being stored and analyzed by the data module, monitoring personnel are reminded by the alarm module, and the normal operation of the water conservancy ditch is ensured by timely distributing and overhauling the signal.
The solar power generation device 13 is a solar power generation panel, or a solar power generation paper, or a solar power generation film. These are all known devices capable of collecting solar energy and converting it into electrical energy. The solar power generation device 13 is suitable for an area where power is not supplied or power is supplied weakly, and the normal operation of the equipment can be guaranteed by solar energy because less force is required for lifting or lowering the gate 3.
In this embodiment, the data module includes a signal acquisition module, a signal storage module and a signal processing module; the signal acquisition module is in signal connection with the drive control device, the position sensor and the liquid flowmeter.
The signal transmission module comprises a data transmitting module, a data receiving module, a wireless network module and a Bluetooth module; the wireless network module and the Bluetooth module can be singly arranged or arranged in a mixed way, and two different wireless controls are realized. The data transmitting module and the data receiving module are in wireless connection with the terminal through the wireless network module and the Bluetooth module. The terminal can observe the detection data of the control equipment in real time, and remote control is achieved through the terminal.
In this embodiment, the driving control device is a control circuit board, which is a conventional control circuit board and mainly performs circuit communication, instruction sending, and signal carrier functions, and the structure and principle thereof are not described herein again.
The working principle is as follows:
manual control: when the closure is needed, the electric telescopic device is manually started, and the gate 3 is driven to descend by the downward extension of the electric telescopic device, so that the closure purpose is achieved. When the gate 3 needs to be opened, the electric telescopic device retracts upwards to drive the gate 3 to lift.
When the gate 3 is in closure, the sealing layer 11 supplies the pressure of the gate 3 towards the water inlet 5 through the axial water on one side of the gate 3, and the pressure makes the sealing layer 11 of the gate 3 in sealing contact with the water inlet 5 to achieve a sealing state, so that water leakage is avoided. When the gate 3 is opened, the gate 3 and the water inlet 5 can be separated easily because the traction of the opening and closing device and the elastic sealing layer 11 are rebounded, and the friction between the gate 3 and the water inlet 5 of the water passing pipe 4 can be reduced when the gate 3 moves up and down after separation, so that the gate 3 is lifted more smoothly, the service life of the equipment is prolonged, and the abrasion to the sealing layer 11 is also reduced.
Electric control: the terminal starts, and sends the instruction of opening or closing, and the instruction passes through wireless network module or bluetooth module transmission, and gives the data module, and the data module is through analysis processes back, sends the instruction of opening or closing for control circuit board, and control circuit board control electric telescopic device's circuit UNICOM or disconnection to the position of gate 3 makes gate 3 rise or descend through position sensor response, realizes damming and the purpose of opening the floodgate.
The liquid flow meter is arranged at the water inlet 5 and can detect the amount of water passing through the water inlet within a certain time. Is any one of a differential pressure type flowmeter, a turbine flowmeter, an electromagnetic flowmeter, a vortex shedding flowmeter, a mass flowmeter and an SST plug-in flowmeter.
The voltage and current signal acquisition module is mainly used for detecting the current in the power supply and is in electric signal connection with the data module. When the voltage or the current collected by the voltage and current signal collecting module is in an abnormal state for a long time, the problem of the power supply can be explained, the signal is sent to the terminal after being stored and analyzed by the data module, monitoring personnel are reminded by the alarm module, and the normal operation of the water conservancy ditch is ensured by timely distributing and overhauling the signal.
In addition, the water pipe in this embodiment may be a circular pipe, or may be a square pipe, which is not limited herein.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (10)
1. An automatic water conservancy control device comprises a frame, an opening and closing device fixed on the frame, a gate connected with the opening and closing device, a water inlet and a water pipe; one end of the water inlet is connected with the water pipe, and the gate is arranged at the water inlet to open and close the water inlet; the method is characterized in that: the device also comprises a driving device, a driving control device and a monitoring device;
the driving device is connected with the driving control device;
the monitoring device comprises a position sensor, a liquid flowmeter, a monitoring control module and a terminal; the position sensor is arranged at the lowest end of the gate; the liquid flowmeter is arranged at the water inlet; the position sensor and the liquid flowmeter are in signal connection with the monitoring control module; the monitoring control module comprises a data module, a signal transmission module and an alarm module; the input end of the alarm module is in signal connection with the data module;
the opening and closing device comprises a driver and a connecting rod, and the connecting rod is connected with the gate and drives the gate to move up and down; the rack comprises two upright columns symmetrically arranged at two sides of the water inlet, and the upright columns are provided with guide rails along the length direction; and a sliding auxiliary device is arranged between the two sides of the gate and the guide rail.
2. The automated water conservancy control device of claim 1, wherein: the sliding auxiliary device is at least one rolling shaft arranged in the guide rail, and the rolling shaft is perpendicular to the running direction of the gate.
3. The automated water conservancy control device of claim 1, wherein: the sliding auxiliary device is at least one pulley arranged on two sides of the gate, and the pulley is matched with the guide rail and slides on the guide rail.
4. The automated water conservancy control device of claim 1, wherein: and a wear-resistant and corrosion-resistant sealing layer is arranged on one surface of the gate close to the water inlet.
5. The automated water conservancy control device of claim 1, wherein: the driving device comprises a driver and a power unit for providing power for the driver.
6. The automated hydraulic control apparatus of claim 5, wherein: the power unit comprises a power supply and a voltage and current signal acquisition module; and the voltage and current signal acquisition module is in electric signal connection with the data module.
7. The automated water conservancy control device of claim 6, wherein: the power supply is a direct current power supply or an alternating current power supply; the direct current power supply comprises a solar power generation device and a storage battery which is connected with the solar power generation device and stores electric quantity.
8. The automated hydraulic control apparatus of claim 7, wherein: the solar power generation device is a solar power generation plate, or solar power generation paper, or a solar power generation film.
9. The automated water conservancy control device of claim 1, wherein: the data module comprises a signal acquisition module, a signal storage module and a signal processing module; the signal acquisition module is in signal connection with the drive control device, the position sensor and the liquid flowmeter.
10. The automated water conservancy control device of claim 1, wherein: the signal transmission module comprises a data transmitting module, a data receiving module, a wireless network module and/or a Bluetooth module; the data transmitting module and the data receiving module are in wireless connection with the terminal through a wireless network module and/or a Bluetooth module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120589453.8U CN214695471U (en) | 2021-03-23 | 2021-03-23 | Automatic change hydraulic control equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120589453.8U CN214695471U (en) | 2021-03-23 | 2021-03-23 | Automatic change hydraulic control equipment |
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| CN214695471U true CN214695471U (en) | 2021-11-12 |
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| CN202120589453.8U Active CN214695471U (en) | 2021-03-23 | 2021-03-23 | Automatic change hydraulic control equipment |
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- 2021-03-23 CN CN202120589453.8U patent/CN214695471U/en active Active
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